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Electronic structure and magnetism of Co-doped (110) SnO 2 surface are investigated using the full-potential linearized augmented plane-wave method. Total energy calculations indicate that Co atoms prefer to surface sites and couple ferromagnetically when they occupy nearest-neighbor sites. Irrespective of the sites that Co dopants occupy, different geometries with ferromagnetic, antiferromagnetic,...
We perform first-principles calculations to investigate the role of carbon dopants in the magnetic properties of C-doped GaN system. Our results indicate that C: GaN system is in ferromagnetic ground state and the magnetization energy is larger than some of the known room-temperature DMS, which implies the high RT ferromagnetism for C: GaN can be expected. The indirect FM interaction between two C...
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